diff --git a/components/drivers/include/drivers/alarm.h b/components/drivers/include/drivers/alarm.h
index 627864727a..546b765a60 100644
--- a/components/drivers/include/drivers/alarm.h
+++ b/components/drivers/include/drivers/alarm.h
@@ -14,62 +14,63 @@
 
 #ifndef __ALARM_H__
 #define __ALARM_H__
-
-#include <time.h>
-
-#define RT_ALARM_TM_NOW        -1    /* set the alarm tm_day,tm_mon,tm_sec,etc. to now.we also call it "don't care" value */
-
-/* alarm flags */
-#define RT_ALARM_ONESHOT       0x000 /* only alarm onece */
-#define RT_ALARM_DAILY         0x100 /* alarm everyday */
-#define RT_ALARM_WEEKLY        0x200 /* alarm weekly at Monday or Friday etc.  */     
-#define RT_ALARM_MONTHLY       0x400 /* alarm monthly at someday */
-#define RT_ALARM_YAERLY        0x800 /* alarm yearly at a certain date */
-
-/* alarm control cmd */
-#define RT_ALARM_CTRL_MODIFY       1 /* modify alarm time or alarm flag */
-
-typedef struct rt_alarm *rt_alarm_t;
-typedef void (*rt_alarm_callback_t)(rt_alarm_t alarm, time_t timestamp);
-
-/* used for low level RTC driver */
-struct rt_rtc_wkalarm
-{
-    rt_bool_t  enable;              /* 0 = alarm disabled, 1 = alarm enabled */
-    rt_int32_t tm_sec;              /* alarm at tm_sec */
-	rt_int32_t tm_min;              /* alarm at tm_min */
-	rt_int32_t tm_hour;             /* alarm at tm_hour */
-};
-
-struct rt_alarm
-{
-    rt_list_t list;
-	rt_uint32_t flag;
-	rt_alarm_callback_t callback;
-	struct tm wktime;
-};
-
-struct rt_alarm_setup
-{
-	rt_uint32_t flag;               /* alarm flag */         
-	struct tm wktime;               /* when will the alarm wake up user */
-};
-
-struct rt_alarm_container
-{
-    rt_list_t head;
-	struct rt_mutex mutex; 
-	struct rt_event event;
-	struct rt_alarm *current;
-};
-rt_alarm_t rt_alarm_create(rt_alarm_callback_t callback, struct rt_alarm_setup *setup);                                 
-rt_err_t rt_alarm_control(rt_alarm_t alarm, rt_uint8_t cmd, void *arg);
-void rt_alarm_update(rt_device_t dev, rt_uint32_t event);
-rt_err_t rt_alarm_delete(rt_alarm_t alarm);
-rt_err_t rt_alarm_start(rt_alarm_t alarm);
+
+#include <time.h>
+
+#define RT_ALARM_TM_NOW        -1    /* set the alarm tm_day,tm_mon,tm_sec,etc.
+                                        to now.we also call it "don't care" value */
+
+/* alarm flags */
+#define RT_ALARM_ONESHOT       0x000 /* only alarm onece */
+#define RT_ALARM_DAILY         0x100 /* alarm everyday */
+#define RT_ALARM_WEEKLY        0x200 /* alarm weekly at Monday or Friday etc. */
+#define RT_ALARM_MONTHLY       0x400 /* alarm monthly at someday */
+#define RT_ALARM_YAERLY        0x800 /* alarm yearly at a certain date */
+
+/* alarm control cmd */
+#define RT_ALARM_CTRL_MODIFY       1 /* modify alarm time or alarm flag */
+
+typedef struct rt_alarm *rt_alarm_t;
+typedef void (*rt_alarm_callback_t)(rt_alarm_t alarm, time_t timestamp);
+
+/* used for low level RTC driver */
+struct rt_rtc_wkalarm
+{
+    rt_bool_t  enable;               /* 0 = alarm disabled, 1 = alarm enabled */
+    rt_int32_t tm_sec;               /* alarm at tm_sec */
+    rt_int32_t tm_min;               /* alarm at tm_min */
+    rt_int32_t tm_hour;              /* alarm at tm_hour */
+};
+
+struct rt_alarm
+{
+    rt_list_t list;
+    rt_uint32_t flag;
+    rt_alarm_callback_t callback;
+    struct tm wktime;
+};
+
+struct rt_alarm_setup
+{
+    rt_uint32_t flag;                /* alarm flag */
+    struct tm wktime;                /* when will the alarm wake up user */
+};
+
+struct rt_alarm_container
+{
+    rt_list_t head;
+    struct rt_mutex mutex;
+    struct rt_event event;
+    struct rt_alarm *current;
+};
+
+rt_alarm_t rt_alarm_create(rt_alarm_callback_t    callback,
+                           struct rt_alarm_setup *setup);
+rt_err_t rt_alarm_control(rt_alarm_t alarm, rt_uint8_t cmd, void *arg);
+void rt_alarm_update(rt_device_t dev, rt_uint32_t event);
+rt_err_t rt_alarm_delete(rt_alarm_t alarm);
+rt_err_t rt_alarm_start(rt_alarm_t alarm);
 rt_err_t rt_alarm_stop(rt_alarm_t alarm);
 void rt_alarm_system_init(void);
-                       
-
 
 #endif /* __ALARM_H__ */